SHORT RANGE ANTIFERROMAGNETIC ORDERING IN FLUORIDE GLASSES "PbMnFeF7 AND "Pb2MnFeF9" A. Le Bail, C. Jacoboni and R. De Pape J. Phys. Colloques, 43 C9 (1982) C9-677-C9-680 DOI: 10.1051/jphyscol:19829133